A SEMINAR ONUNDER WATER WINDMILL

Presented by:CHETHAN KUMAR

Mechanical Engineering

CONTENTSIntroductionMain partsWorking principleTypesAdvantagesDisadvantagesGlobal resourcesConclusionReferences

INTRODUCTIONWhat is it ??? An Underwater windmill like a device that extracts power

from the tides. Renewable energy technologies are becoming an

increasingly favourable alternative to conventional energy sources to assuage fossil fuel related issues.

Tidal energy offers a vast and reliable energy source. This technology is similar to wind energy technology, with the rotor blades driven not by wind power but by tidal currents.

The gravitational pull of the moon produces a swift tidal current, which spins the long blades of the turbine . Which in turn produces electricity via different parts of underwater windmill .

This Energy derived from the moon that now helps to power a small arctic village.

NAME JUSTIFICATION Why it is called as “underwater windmill” ?"Basically it's like putting a windmill in the

water," said Bjorn Bekken, a project manager for Hammerfest Strom.

Or as it’s looking like a wind mill & are installed on the ocean floor and large river bed , that means these are under the water.

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MAIN PARTSTurbinesGearboxGeneratorCablessupport

PRINCIPLE OF OPERATIONIn simple a underwater windmill consists of a

number of blades mounted on a hub (together known as the rotor), a gearbox, and a generator.

The hydrodynamic effect of the flowing water past the blades causes the rotor to rotate, thus turning the generator to which the rotor is connected via a gearbox.

The gearbox is used to convert the rotational speed of the rotor shaft to the desired output speed of the generator shaft.

The electricity generated is transmitted to land through cables.

TYPES :There are two types of underwater windmill1. Horizontal axis 2. Vertical axis In horizontal axis underwater windmill , the

rotor shaft is parallel to the direction of the flow of water.

In vertical axis underwater windmill , the rotor shaft is perpendicular to the direction of the flow of water.

ABOUT TURBINES…The turbines can convert kinetic hydro

energy into power ranging from 25 kW to 250 kW, depending on turbine size and current.

Kinetic energy is converted to mechanical power in a nacelle within the turbine.

WORKING…Underwater ( tidal) turbines are a fairly

straightforward concept, as far as cutting-edge energy technology goes.

They are essentially windmills installed onto an ocean floor or river bed.

The underwater current produced by the tides spins blades arranged like an airplane propeller.

These turbines are attached to a gear box, which is connected to an electrical generator.

This produces the electricity that is carried by cable to shore.

Once it's plugged into an electrical grid, the electricity can be distributed.

SPECIALIZATIONHow it is special from others like, 1.Watermill 2.WindmillLets Know………

WATERMILLA watermill is a structure that uses a water wheel

or turbine to drive a mechanical process such as flour, lumber or textile production, or metal shaping (rolling, grinding or wire drawing).

There are two basic types of watermill, one powered by a vertical waterwheel via a gearing mechanism, and the other equipped with a horizontal waterwheel without such a mechanism.

The former type can be further divided, depending on where the water hits the wheel paddles, into undershot, overshot, breastshot and reverse shot waterwheel mills.

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Watermill of Braine-le-Château, Belgium (12th century)

CONCEPTICAL DIAGRAMS

Undershot water wheel, applied for watermilling since the 1st century BC

Overshot water wheel, applied for watermilling since the 1st century BC

Breastshot water wheel, applied for watermilling since the 3rd century AD

WIND MILL

ADVANTAGES: The advantages of under water windmill

is much more than the disadvantages:-Uses Tidal energy ,which is a clean and

renewable source of energyHave lesser impact on the environmentLow running costLong lifetime with little maintenanceReduces the dependence upon fossil fuels

DISADVANTAGES:The initial cost is too highVery difficult to installThe blade must be coated to avoid

corrosionSpecial type material must have to be

used for blade

GLOBAL RESOURCES

It is widely agreed that, tidal stream energy capacity could exceed 120GW globally . The UK has one of the largest marine energy resources in the world.

CONCLUSION Tides play a very important role in the formation of global

climate as well as the ecosystems for ocean habitants. At the same time, tides are a substantial potential source of

clean renewable energy for future human generations. Depleting oil reserves, the emission of greenhouse gases by

burning coal, oil and other fossil fuels, as well as the accumulation of nuclear waste from nuclear reactors will inevitably force people to replace most of our traditional energy sources with renewable energy in the future .

Tidal energy is one of the best candidates for this approaching revolution. Development of new, efficient, low-cost and environmentally friendly hydraulic energy converters suited to free-flow waters.

This type of machine, moreover ,can be used not only for multi-megawatt tidal power farms but also for mini-power stations with turbines generating a few kilowatts.

REFERENCEShttp://www.marineturbines.com/http://www.renewable-solarenergy.com/tidal-energ

y-power.htmlInternational Energy Agency, World Energy

Outlook 2007.Prandle, D., Simple theory for designing tidal

power schemes, Advances in Water Resources, 1984.

Sheth, S. and M. Shahidehpour, Tidal Energy in Electric Power Systems, in Power Engineering Society General Meeting, 2005.

http://www.tidalenergyltd.com/technology.htm

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